Method, device, and computer-readable medium for changing size of touch permissible region of touch screen

ABSTRACT

A method of controlling a touch screen of an electronic device includes the following steps: switching the touch screen from a normal state into a shrunk state; and confining a touch interactive region of the touch screen to a sub-region of the touch screen and positioning a non-interactive region of the touch screen away from an edge of the touch screen to be partially covered by a finger performing an operation when the touch screen is in the shrunk state. The touch interactive region is a region within which the touch screen displays an interactive frame, and when the touch screen is in the normal state, the touch interactive region extends beyond the sub-region.

CROSS REFERENCE TO RELATED APPLICATIONS

This continuation application claims the benefit of U.S. patentapplication Ser. No. 13/424,369, filed on Mar. 19, 2012, the contents ofwhich are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates generally to a touch screen, and moreparticularly, to a method, device, and computer-readable medium forchanging the size of a touch permissible region of a touch screen.

2. Description of the Prior Art

A touch screen is an electronic component that can display a frame ofimage and in the meantime detect the presence and location of a touchmade by a living body. Because touch screens facilitate user-machineinteraction that is not only convenient but also intuitive, they arewidely applied in various kinds of electronic devices.

Under some circumstances, a user may find the use of a touch screen lessconvenient. For example, the user of a large-screen smart phone maybeunable to reach some portion of the phone's touch screen if the user isholding the phone with only the right/left hand and manipulating thetouch screen with only the right/left thumb. As another example, theuser of a large-screen touch TV may find it difficult to reach someportion of the touch screen without taking one or a few steps. As stillanother example, a touch screen may have some dead points and as aresult some interactions involving these dead points will becomeunavailable.

SUMMARY OF THE INVENTION

It is therefore one objective of the present invention to provide amethod, device and computer-readable medium for changing the size of atouch permissible region of a touch screen to solve the above problems.

According to an embodiment of the present invention, an exemplary methodof controlling a touch screen of an electronic device is disclosed. Theexemplary method comprises the following steps: switching the touchscreen from a normal state into a shrunk state; and confining a touchinteractive region of the touch screen to a sub-region of the touchscreen and positioning a non-interactive region of the touch screen awayfrom an edge of the touch screen to be partially covered by a fingerperforming an operation when the touch screen is in the shrunk state.The touch interactive region is a region within which the touch screendisplays an interactive frame, and when the touch screen is in thenormal state, the touch interactive region extends beyond thesub-region.

According to an embodiment of the present invention, an exemplaryelectronic device is disclosed. The exemplary electronic devicecomprises an input unit, a display unit and a processor. The processoris coupled to the input unit and the display unit, and arranged forswitching the display unit from a normal state into a shrunk state. Whenthe display unit is in the shrunk state, the processor confines aninteractive region of the display unit to a sub-region of the displayunit and positions a non-interactive region of the display unit awayfrom a specific side of the display unit. The specific side of thedisplay unit is determined in response to an input signal received bythe input unit during or after the switching of the display unit. Theinteractive region is a region within which the display unit displays aninteractive frame. When the display unit is in the normal state, theinteractive region extends beyond the sub-region

According to an embodiment of the present invention, an exemplarynon-transitory computer-readable medium storing a computer program isdisclosed. When executed by an electronic device comprising a touchscreen, the exemplary non-transitory computer-readable medium causes theelectronic device to perform the following operations: switching thetouch screen from a normal state into a shrunk state; and confining atouch interactive region of the touch screen to a sub-region of thetouch screen and positioning a non-interactive region of the touchscreen away from an edge of the touch screen to be partially covered bya finger performing an operation when the touch screen is in the shrunkstate. The touch interactive region is a region within which the touchscreen displays an interactive frame, and when the touch screen is inthe normal state, the touch interactive region extends beyond thesub-region.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a simplified block diagram of an electronic deviceaccording to an embodiment of the invention.

FIG. 2 shows a schematic diagram of an exemplary setting of a sub-regionof the touch screen of FIG. 1.

FIG. 3 shows two schematic diagrams comparing how an interactive frameis displayed on the touch screen of FIG. 1 in a normal and a shrunkstate.

FIG. 4 shows two schematic diagrams of the operating system (OS) programof the electronic device of FIG. 1 when the touch screen of FIG. 1 is inthe normal and the shrunk states.

FIG. 5 shows a flowchart of an exemplary method of controlling the touchscreen of FIG. 1.

DETAILED DESCRIPTION

FIG. 1 shows a simplified block diagram of an electronic device 100according to an embodiment of the invention. As some examples, theelectronic device 100 can be a smart phone, a tablet computer, acomputer monitor, a personal digital assistant (PDA), a satellitenavigation device, a handhold gaming device, or a television (TV). Theelectronic device 100 of this embodiment includes at least a processor110, a memory 120, and a touch screen 130. The touch screen 130 can bean integrated component or an external component of the electronicdevice 100.

The memory 120 stores codes of an operating system (OS) program and someapplication programs, and some other data. The processor 110 executesthe OS program and the application programs to control the operations ofthe electronic device 100. The touch screen 130 is an input/output (I/O)interface through which the electronic device 100 displays image framesto the user and receives touch instructions from the user. In additionto the three depicted components, the electronic device 100 can furtherinclude some other components, such as other components thatinterconnect or assist the interactions between the three depictedcomponents, other I/O interfaces that allow the electronic device 100 tocommunicate with the outside world, and other components of otherfunctions. These other components are omitted from FIG. 1 to avoiddistraction.

The touch screen 130 has a touch permissible region, i.e. a regionwithin which the touch screen 130 displays an interactive frame. Theinteractive frame is a frame of image that can contain one or moretouchable portions at which the electronic device 100 is defined to beable to response to a touch operation made by a user of the electronicdevice 100. In other words, when the user touches a touchable portion ofthe frame of image, the electronic device 100, in response to the touchoperation, is controlled to react to the user's input/touch. Forexample, a touchable portion can be a user-interface object such as anicon, a virtual button, or a virtual knob. As another example, atouchable portion can be a virtual writing/drawing pad on which the usercan write/draw. An interactive frame needs not be entirely touchable.For example, an interactive frame can have a background image and atleast one user-interface object overlaid thereon, wherein the backgroundimage can be a wall paper or a blank background. The portions of theinteractive frame that are not occupied by the user-interface objectscan be untouchable portions. For example, when the electronic device 100is locked, an interactive frame displayed thereon may include an icon oran unlock image that occupies only a limited portion of the touch screen130. The rest of the interactive frame can be an untouchable portion andbe either blank or occupied by a part of a background image.

The touch screen 130 of this embodiment has a normal state and a shrunkstate. For example, the shrunk state can be a special state of the touchscreen 130, under which the electronic device 100 confines the touchpermissible region to a sub-region of the touch screen 130. In addition,the normal state can be a default state of the touch screen 130, underwhich the electronic device 100 allows the touch permissible region toextend beyond the sub-region. For example, when the touch screen 130 isin the normal state, the touch permissible region can coincide with afull-region of the touch screen 130.

When the touch screen 130 is in the shrunk state, the area outside thesub-region can be a blank area or be occupied by a part of a backgroundimage. If a background image exists in the area outside of thesub-region, the interactive frame displayed within the sub-region can beoverlaid on the background image, like an on screen display (OSD). If auser touches the un-overlaid portion of the background image, theelectronic device 100 does not respond to the user's touch. To put itdifferently, if the interactive frame is originally of the full size ofthe touch screen 130, i.e. the size of the full-region, the electronicdevice 100 first shrinks the interactive frame into the size of thesub-region, then overlays the shrunk interactive frame on the backgroundimage to create the displayed image frame with a size of the full regionof the touch screen 130. The displayed image frame is displayed on thetouch screen 130 so that the interactive frame, which has been shrunkalready, is confined within the sub-region.

If a frame to be displayed is not interactive in nature, e.g. the frameis a read-only image that contains no user-interface objects, noembedded hyperlinks, and no editable areas, the electronic device 100can have the touch screen 130 display the frame in the full-regionregardless of whether the touch screen 130 is in the normal or theshrunk state. For example, such a frame can be a video frame or, animage frame provided by a screensaver, a page of a plain electronicbook, or a photo image. Alternatively, the electronic device 100 canhave the touch screen 130 display the non-interactive frame in thefull-region if the touch screen 130 is in the normal state and in thesub-region if the touch screen 130 is in the shrunk state.

The user of the electronic device 100 can set whether the touch screen130 can be switched between the normal state and the shrunk state.Furthermore, the electronic device 100 can be configured to allow theuser to pre-set the orientation, location, and size of the sub-regionand the conditions of switching. FIG. 2 shows a schematic diagram of anexemplary setting of the sub-region of the touch screen 130 of FIG. 1.This example is based on the assumptions that the electronic device 100is a handhold device, the user is right-handed, and the user sometimesholds the electronic device 100 with the right hand and manipulates thetouch screen 130 with only the right thumb. In FIG. 2, the largerectangle represents the full-region of the touch screen 130. When theuser is holding the electronic device 100 with the right hand, theuser's right thumb is able to reach the region on right side of thetouch screen 130 defined by a broken curve, but is unable to reach theregion on the left side of the touch screen 130 defined by the brokencurve. The user's left hand may be unavailable in the meantime, e.g.because it is holding/grabbing another thing such as an umbrella, ahandbag, or a handrail. To facilitate one hand manipulation of the touchscreen 130, the user can pre-set the sub-region so that it's on thelower right corner of the full-region, and to the extent the upper leftcorner of the sub-region is on the broken curve or on the right side ofthe broken curve. The electronic device 100 may require the user topre-set the sub-region only once or set the sub-region every time theuser wants to switch the touch screen 130 from the normal state to theshrunk state.

FIG. 3 shows two schematic diagrams comparing how an interactive frameis displayed on the touch screen 130 of FIG. 1 in the normal and shrunkstates. Regardless of how the shrunk state is realized, in the shrunkstate the perception of the user may be that an interactive frame hasbeen shrunk from the size of the full-region into the size of thesub-region and placed within the sub-region. If the user is holding theelectronic device 100 with the right hand and manipulating the touchscreen 130 with only the right thumb, the user can reach all the virtualbuttons displayed on the touch screen 130 when it's in the shrunk state.In contrast, if the touch screen 130 is in the normal state, the user'sright thumb won't be able to reach the virtual button of number 1. As aresult, confining the interactive frame within the sub-region canfacilitate the user's one hand manipulation of the touch screen 130.

As shown in FIG. 3, a point displayed on coordinates (x, y) when thetouch screen 130 is in the normal state will instead be displayed oncoordinates (x′, y′) when the touch screen 130 in the shrunk state. Thecoordinates (x, y) lies within a normal coordinate system defined byfour corner points (x1, y1), (x2, y1), (x1, y2), and (x2, y2). Thenormal coordinate system corresponds to the full-region of the touchscreen 130; (x2−x1) and (y2−y1) are equal to the width W and height H ofthe full-region, respectively. The coordinates (x′, y′) lies within ashrunk coordinate system defined by four corner points. (x1′, y1′),(x2′, y1′), (x1′, y2′), and (x2′, y2′) The shrunk coordinate systemcorresponds to the sub-region of the touch screen 130; (x2′−x1′) and(y2′−y1′) are equal to the width W′ and height H′ of the sub-region,respectively. For example, in FIG. 3, the corner points (x2, y2) and(x2′, y2′) are on the same location of the touch screen 130. In otherwords, x2 equals to x2′, and y2 equals to y2′.

If the OS program of the electronic device 100 is designed to supporttouch screens with different sizes, in the shrunk state the electronicdevice 100 can disable the pixels outside the sub-region, treat thetouch screen 130 as if the sub-region constitutes a full-region, anddrive the touch screen 130 accordingly. For example, if the size of thetouch screen is 4.2 inches and the size of the sub-region is 3.2 inchesand the OS program supports both 4.2-inch and 3.2-inch touch screens, inthe shrunk state the electronic device 100 can confine an interactiveframe within the sub-region by driving the touch screen 130 as if it's a3.2-inch touch screen.

As an alternative, in the shrunk state the OS program can performscoordinate transformation in order to transform a pair of coordinates(x, y) on the normal coordinate system into a pair of correspondingcoordinates (x′, y′) on the shrunk coordinate system, and vice versa.FIG. 4 shows two schematic diagrams of the OS program of the electronicdevice 100 when the touch screen 130 is in the normal and shrunk states.The OS program has an OS kernel 410 that is responsible for, among otherduties, providing core system services and interacting with a touchsensor input module 420, a screen output module 430, and a remainingpart 440 of the OS program. The touch sensor input module 420 can be adriver that drives the touch screen 130 to detect touches; the screenoutput module 430 can be a driver that drives the touch screen 130 todisplay frames of images successively.

When the touch screen 130 is in the normal state, the OS kernel 410, thetouch sensor input module 420, and the screen output module 430 all usesthe normal coordinate system and there may be no need for coordinatetransformation. When the touch screen 130 is in the shrunk state, the OSkernel 410 can keep using the normal coordinate system but in effect thetouch sensor input module 420 and the screen output module 430 use theshrunk coordinate system instead. As a result, when the touch screen 130is in the shrunk state, the OS program can further include a mappingmodule 450 for transforming each point (x, y) on the normal coordinatesystem into a corresponding point (x′, y′) on the shrunk coordinatesystem, and vice versa.

Specifically, the mapping module 450 transforms display coordinates fromthe normal coordinate system to the shrunk coordinate system. Forexample, when the OS kernel 410 wants a pixel to be displayed on point(x, y) of the normal coordinate system, the mapping module 450 willtransform the location into (x′, y′) on the shrunk coordinate system sothat the screen output module 430 can drive the touch screen 130 todisplay that pixel on point (x′, y′). In effect, the mapping module 430shrinks an interactive frame from the size of the full-region into thesize of the sub-region and confines the shrunk interactive frame to thesub-region. Using FIG. 3 as an example, the coordinate transformationcan be performed based on the following equations:x′=(x−x1)·(W′/W)+x1′y′=(y−y1)·(H′/H)+y1′

Furthermore, the mapping module 450 transforms touch sensor coordinatesfrom the shrunk coordinate system to the normal coordinate system. Forexample, when the touch screen 130 informs the touch sensor input module420 that a touch has been detected on point (x′, y′), the mapping module450 will transform the location into (x, y) on the normal coordinatesystem and inform the OS kernel 410 a touch has been detected on point(x, y). Using FIG. 3 as an example, the coordinate transformation can beperformed based on the following equations:x=(x′−x1′)·(W/W′)+x1y=(y′−y1′)·(H/H′)+y1

FIG. 5 shows a flowchart of an exemplary method of controlling the touchscreen 130. At step 510, the electronic device 100 first determineswhether a set of condition(s) for switching the touch screen 130 fromthe normal state to the shrunk state is satisfied. If the set ofcondition(s) is not satisfied, the electronic device 100 enters step520; otherwise, the electronic device 100 enters step 530.

For example, the set of condition(s) may include: (1) the user hasactivated the screen-shrink function (so that the touch screen 130 isallowed to be switched from the normal state to the shrunk state) ; and(2) the electronic device 100 has detected a trigger event. If theelectronic device 100 is a handhold device, the detection of the triggerevent may indicate that the user is holding and manipulating theelectronic device 100 with only one hand. For example, the trigger eventmay be that the user unlocks the electronic device 100 with a firstgesture. In such an example, whenever the electronic device 100 islocked, the electronic device 100 may allow the user to use either thefirst or a second unlock gesture to unlock the electronic device 100.The first unlock gesture allows the user to unlock the electronic device100 and switch the touch screen 130 to the shrunk state. The secondunlock gesture allows the user to unlock the electronic device 100 andmaintain the touch screen 130 at the normal state.

As another example, the trigger event may be that the orientation of theelectronic device 100 lies within a specific range when the user turnson the electronic device 100 or unlocks electronic device 100. In suchan example, the electronic device 100 needs to have an electronicgyroscope, e.g. MEMS gyroscope, or 3D accelerometers in order todetermine the orientation. Furthermore, the user may need to pre-set thespecific range. One of the rationales behind this example is that thedetected orientation may indicate whether the user is holding theelectronic device 100 with only one hand or with both hands. In stillanother example, the trigger event is that the user specificallyinstructs the electronic device 100 to switch the touch screen 130 tothe shrunk state.

At step 520, the electronic device 100 controls the touch screen 130 atthe normal state and allows the full-region of the touch screen 130 toserve as the touch permissible region. Specifically, the electronicdevice 100 maintains the touch screen 130 in the normal state if it'salready in the normal state or switches the touch screen 130 to thenormal state if it's in the shrunk state. Since the normal state can bea default state of the touch screen 130, when the touch screen 130 is inthis state, the electronic device 100 may drive it normally withoutperforming other additional/special operations. For example, when thetouch screen 130 is in the normal state, the electronic device 100 maydisplay an interactive frame on the full-region of the touch screen 130without first shrinking the interactive frame.

At step 530, the electronic device 100 controls the touch screen 130 atthe shrunk state and confines the touch permissible region to thesub-region. Specifically, the electronic device 100 switches the touchscreen 130 to the shrunk state if it's in the normal state or maintainsthe touch screen 130 in the shrunk state if it's already in the shrunkstate. Since the shrunk state can be a special state of the touch screen130, when the touch screen 130 is in this state, the electronic device100 may need to perform some additional/special operations. For example,as mentioned above, the electronic device 100 can treat the sub-regionas a full-region of the touch screen 130, and drive the touch screen 130accordingly. As another example, the electronic device 100 can performcoordinate transformation in order to confine a displayed interactiveframe within the sub-region.

At step 540, the electronic device 100 determines whether another set ofcondition(s) for switching the touch screen 130 from the shrunk state tothe normal state is satisfied. If the set of condition(s) is notsatisfied, the electronic device 100 returns to step 530; otherwise, theelectronic device 100 enters step 520.

The set of condition(s) may include the detection of a trigger event.For example, the trigger event may be that the electronic device 100 hasbeen locked, whether automatically or manually. As another example, thetrigger event may be that the user unlocks the electronic device 100using the second one of the aforementioned two unlock gestures. In athird example, the trigger event may be that the orientation of theelectronic device 100 does not lie within the aforementioned specificrange when the user turns on the electronic device 100 or unlocks theelectronic device 100. In a fourth example, the trigger event is thatthe user specifically instructs the electronic device 100 to switch thetouch screen 130 to the normal state, e.g. by manipulating (such astouching) a screen-expansion image displayed on the touch screen 130when it's in the shrunk state. To facilitate the fourth example, theelectronic device 100 can control the touch screen 130 to additionallydisplay the screen-expansion image whenever the touch screen 130 is inthe shrunk state.

The aforementioned shrunk state can facilitate the user's use the touchscreen 130. For example, the shrunk state can make the use moreconvenient if the electronic device 100 is a large-screen smart phonethat the user is holding with only the right/left hand and manipulatingwith only the right/left thumb. As another example, the shrunk state canmake the use more convenient if the electronic device 100 is alarge-screen touch TV and the user wants to stand still in using thetouch screen 130. As still another example, the shrunk state can makethe use more convenient if the touch screen 130 has some dead points andit happens that the user needs to use some of the dead points tointeract with the electronic device 100. Specifically, the shrunk stateallows a user-interface object of interest to the user to be relocatedfrom a dead point to a normal point of the touch screen 130.

Any of the aforementioned control methods, or any combination thereof,can be codified into a computer program. The computer program can bestored in a computer readable medium, such as the memory 120 shown inFIG. 1. When being executed by the processor 110, the computer programcan cause the electronic device 100 to perform the codified method (s).

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A method of controlling a touch screen of anelectronic device, comprising: switching the touch screen from a normalstate into a shrunk state; and scaling down a content of a touchinteractive region of the touch screen to a sub-region of the touchscreen and changing an initial center position of the touch interactiveregion when the touch screen is in the shrunk state, wherein the touchinteractive region is a region within which the touch screen displays aninteractive frame, and when the touch screen is in the normal state, thetouch interactive region extends beyond the sub-region.
 2. The method ofclaim 1, wherein the scaling down step comprises: shrinking theinteractive frame from a first size of the touch screen into a size ofthe sub-region, wherein the first size of the touch screen is largerthan the size of the sub-region; and displaying the shrunk interactiveframe within the sub-region.
 3. The method of claim 1, wherein thescaling down step comprises: providing a plurality of interactionfunctions of the electronic device through the sub-region.
 4. The methodof claim 1, wherein when the touch interactive region of the touchscreen is confined to the sub-region, each operation object displayed onthe touch screen is reachable by a thumb of a hand determined to beholding the electronic device.
 5. The method of claim 1, wherein aboundary of the sub-region is determined according to a region on thetouch screen reachable by a finger of a hand determined to be holdingthe electronic device.
 6. The method of claim 1, wherein the sub-regionfor providing a user interaction ability is determined by a touchoperation performed by a single hand determined to be holding theelectronic device, in which the user interaction ability will not belesser after switching the touch screen from the normal state into theshrunk state.
 7. An electronic device, comprising: an input unit; adisplay unit; and a processor, coupled to the input unit and the displayunit, for switching the display unit from a normal state into a shrunkstate, wherein when the display unit is in the shrunk state, theprocessor scales down a content of an interactive region of the displayunit to a sub-region of the display unit and changes an initial centerposition of the interactive region of the display unit, wherein theinteractive region is a region within which the display unit displays aninteractive frame; and when the display unit is in the normal state, theinteractive region extends beyond the sub-region.
 8. The electronicdevice of claim 7, wherein the processor is further configured to:shrink the interactive frame from a first size of the display unit intoa size of the sub-region, wherein the first size of the display unit islarger than the size of the sub-region; and display the shrunkinteractive frame within the sub-region.
 9. The electronic device ofclaim 7, the processor is further configured to: provide a plurality ofinteraction functions of the electronic device through the sub-region.10. The electronic device of claim 7, wherein the display unit is atouch screen; and when the interactive region of the display unit isscaled down to the sub-region, each operation object displayed on thedisplay unit is reachable by a thumb of a hand determined to be holdingthe electronic device.
 11. The electronic device of claim 7, wherein thedisplay unit is a touch screen, a boundary of the sub-region isdetermined in response to a gesture.
 12. The electronic device of claim11, wherein the gesture is performed by a finger.
 13. The electronicdevice of claim 7, wherein the display unit is a touch screen, and thesub-region for providing a user interaction ability is determined by atouch operation performed by a single hand determined to be holding theelectronic device, in which the user interaction ability will not belesser after switching the touch screen from the normal state into theshrunk state.
 14. The electronic device of claim 7, wherein theprocessor scales down a content of an interactive region of the displayunit to a sub-region of the display unit in response to a gesture. 15.The electronic device of claim 7, wherein the processor, in response toanother gesture, restores the content of the interactive region scaledowned into the sub-region back to a full-region.
 16. A non-transitorycomputer-readable medium storing a computer program which, when executedby an electronic device comprising a touch screen, causes the electronicdevice to perform operations comprising: switching the touch screen froma normal state into a shrunk state; and scaling down a content of atouch interactive region of the touch screen to a sub-region of thetouch screen and changing an initial center position of the touchinteractive region of the touch screen when the touch screen is in theshrunk state, wherein the touch interactive region is a region withinwhich the touch screen displays an interactive frame, and when the touchscreen is in the normal state, the touch interactive region extendsbeyond the sub-region.
 17. The non-transitory computer-readable mediumof claim 16, wherein the scaling down operation comprises: shrinking theinteractive frame from a first size of the touch screen into a size ofthe sub-region, wherein the first size of the touch screen is largerthan the size of the sub-region; and displaying the shrunk interactiveframe within the sub-region.
 18. The non-transitory computer-readablemedium of claim 16, wherein the scaling down operation comprises:providing a plurality of interaction functions of the electronic devicethrough the sub-region.
 19. The non-transitory computer-readable mediumof claim 16, wherein when the touch interactive region of the touchscreen is scaled down to the sub-region, each operation object displayedon the touch screen is reachable by a thumb of a hand determined to beholding the electronic device.
 20. The non-transitory computer-readablemedium of claim 16, wherein a boundary of the sub-region is determinedaccording to a region on the touch screen reachable by a finger of ahand determined to be holding the electronic device.
 21. Thenon-transitory computer-readable medium of claim 16, wherein thesub-region for providing a user interaction ability is determined by atouch operation performed by a single hand determined to be holding theelectronic device, in which the user interaction ability will not belesser after switching the touch screen from the normal state into theshrunk state.